Exodus 7:7-9

American Standard Version

⁷ And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.

⁸ And Jehovah spake unto Moses and unto Aaron, saying, ⁹ When Pharaoh shall speak unto you, saying, Show a wonder for you; then thou shalt say unto Aaron, Take thy rod, and cast it down before Pharaoh, that it become a ^[a]serpent.